Daylight lamp for color matching, perching, and similar purposes



March 27, 1928. A 1,664,332

L. AsTc TT DAYLIGHT LAMP FOR COLOR MATCHING, PERCHING, AND SIMILAR PURPOSES Filed 001;. l, 1925 l l l l 1 l I -l I Patented Mar. 27, 1928. I

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LOUIS STOITT, OFIIALIFAX, ENGLAND, ASSIGNOR TO SMITH, vIBUIJMEIR, COMPANY, LIMITED, .OF HALIFAX, ENGLAND, A CORPORATION OF GREAT BRITAIN.

DAYLIGIIT Lararron coLon MATCHING, rnncrrrne, AND SIMILAR PURPOSES.

j Application filed October 1, 1925, Serial No; 59,905, andin Great Britain-January 19, 1925.

This invention relates to daylight lamps for use in color-matching by dyers and others perching or inspecting yarn, cloth, and for other similar purposes, and the object of my invention is an improved construction of this type ot lamp whereby the rays of light given oil' by an electric lamp and radiating upon the sides ot the lamp chamber and upon the other' deflectors therein, are more or less concentrated and de,- fiected 'on to the glass panel.

A further object ot the invention' is' to provide a simple and efficient means for ventilating the lamp casing or housing without allowing any ofthe rays from the lamp therein escaping or passing outward except through the glass panel.

Another object of the invention is to provide a simple and readily adjustable means for varying the relation ot the lamp to the glass panel.

I attain these objects by the means illustrated in the accompanying drawing, in which Fig. 1 is a sectional side elevation of my improved daylight lamp.

Fig. 2 is a front elevation partly in section of Fig. l.

Fig. 3 is a detail showing a sectional view of one of the angular strips or detlectors secured to or formed on the sides of the lamp.

Referring to the drawing. A is the lamp casing angular in shape, and which may be secured to a wall or other support, by screws B passing through brackets C attached to said chamber, or by other suitable means. D is the upper section or portion ot the front wall ot said casing which may be formed integral with the top or sides of the casing and extends at an approximate angle of 67o to the horizontal. The lower portion of the front wall of the casing includes the glass panel E mounted in a surrounding frame F which is hinged at G to the front wall section D; the said panel when occupying a normal position is at an approximate angle of 135 to the horizontal base of the lamp casing. The hinged panel E is adapted to be moved upon its hinges to afford access to the interior ot the vcasing when desired, and is secured in the closed position by a hasp H, or by any other suitable means. J is an angular reflector one or more of which is or may be attached to the sides of the lamp chamber and arranged at an ap- 'j proximate angle of LOQto the 'back of they latter.y As shown in Figure 3, the reliectors` are of substantially V-shapeV in transverse cross section.

K is the electric light bulb or lamp of suit# able candle power carried by the holder L' which is securedtoone end of anadjustabley tube M movable vertically within a sleeve N secured Vto aslidable shutter P 'operating-in guides R attached to thetop of the chamber A.

M and the latter is securedl afteradj ustmentf,

the shutter R. V is an air admission tube VThe flexible conductor S for supplying. current tothelamp passes through fthetube surrounding an opening W in the floor of the lamp chamber and is surmounted by the double cone shaped cowl X. Y is a conical ballie fixed within the cowlX forl preventing any escape vof light except through the panel E. Z, Z, are similar means provided in the roof of the chamber A for permitting the escape of hot air therefrom and alsc preventing the escape of light, as aforesaic.

The internal sides of the lamp chamber and l other parts serving as reflectors or deliectors is ot such a size and arranged at-such an angle as toy greatly extend the sphere of operations for which daylight lamps are required, as well as their eliiciency.

That is the angular faces of the relatively narrow diagonally extending, strip-like relectors J intercept and re-reflect rays reiiected from the casing walls so that all of the light is diffused. throughout the chamber and over the inclined glass panel E.

By arranging the reflecting strips J in the particular relation to the walls of the casing and the panel Ehereinbetore described, and making said strips ot1 the cross sectional form shown, it has been found possible to diiuse thc light uniformly over the entire area of the glass panel.

vAll of the joints between the several members of the casing are of overlapping construction and the ventilation apertures are of the character before described so that vthe passage of any rays of light outward from the casing except vthrough the glass panel is prevented. v

hat I claim as my invention, and desire to secure by Letters Patent, is

1. A daylight lamp for the purpose described comprising a casing having a transparent panel in its front wall extending at an obtuse angle to the bottom of the casing, the inner` faces of the walls of the casing constituting reflecting surfaces, a source of illumination within the casing, and rela- 15 tively narrow, elongated, reflectors extending diagonally of theinner faces of the side walls of the casing, for thekkpurpose described.

2.. A daylight lampV for therp'urposesfdescribed comprising a casing having a transparent panelinAv its front. wall extending atV an obtuse kangle to the bottom of thecasing,

lthe ,inner faces of the walls of the casing constituting reflecting surfaces, a source of illumination within the casing, and relatively narrow, elongated, reflectors of substantially V-shape in transverse cross section extending diagonally of the inner faces of the side walls of the casing with their apices directed inward, for the purpose described.

3. A daylightv lamp for the purpose de scribed comprising a casing having ventilation openings in its top and bottom, and its front wall including a transparent vpanel extending at an obtuse angle to thebottom of the casing and hinged at its forward upper edge to the casing, the inner faces of the walls ofv the casing constitutingl reflecting surfaces, a source of illumination within the casing,

flectorsy extending diagonally of the inner faces of the side walls of the casing from' the rearlower corners of the casing to they upper forward corners thereof, for the pur-A pose described. y

In testimony whereof I have signed my name to this specication.

Louis sToTT.;

and relatively narrow, elongated, rev-v, 

